[1] Natl Univ Singapore, Yong Loo Lin Sch Med, Singapore, Singapore
[2] Natl Univ Singapore Hosp, Emergency Med Dept, Singapore, Singapore
[3] Geriatr Educ & Res Inst, Dept Educ, Singapore, Singapore
[4] Maastricht Univ, Fac Hlth Med & Life Sci, Sch Hlth Profess Educ, Maastricht, Netherlands
[5] Natl Univ Singapore Hosp, Dept Emergency Med, 5 Lower Kent Ridge Rd,1 Main Bldg, Singapore 119074, Singapore